text: Charles' law, or the law of volumes, was founded in 1787 by Jacques Charles. It states that, for a given mass of an ideal gas at constant pressure, the volume is directly proportional to its absolute temperature, assuming in a closed system.
  The statement of Charles' law is as follows:
  the volume (V) of a given mass of a gas, at constant pressure (P), is directly proportional to its temperature (T).